[PATCH net-next v5 3/3] net: stmmac: allow non-linear xdp_buff in XDP mode

[Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>]

Since the RX path now builds multi-buffer xdp_buffs, XDP can operate on
frames bigger than ETH_DATA_LEN (jumbo frames and scatter-gather
frames). Drop the checks that rejected attaching an XDP program when
the MTU is larger than ETH_DATA_LEN, and that refused to increase the
MTU while XDP is enabled.

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ------
 drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c  | 8 --------
 2 files changed, 14 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index be2cba8fcbc6..cbeb43011c4b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -6351,12 +6351,6 @@ static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
 		txfifosz = priv->dma_cap.tx_fifo_size;
 
 	txfifosz /= priv->plat->tx_queues_to_use;
-
-	if (stmmac_xdp_is_enabled(priv) && new_mtu > ETH_DATA_LEN) {
-		netdev_dbg(priv->dev, "Jumbo frames not supported for XDP\n");
-		return -EINVAL;
-	}
-
 	new_mtu = STMMAC_ALIGN(new_mtu);
 
 	/* If condition true, FIFO is too small or MTU too large */
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
index 9af9e0cb366c..f6b3e8628a7c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
@@ -109,14 +109,6 @@ int stmmac_xdp_set_prog(struct stmmac_priv *priv, struct bpf_prog *prog,
 
 	if_running = netif_running(dev);
 
-	if (prog && dev->mtu > ETH_DATA_LEN) {
-		/* For now, the driver doesn't support XDP functionality with
-		 * jumbo frames so we return error.
-		 */
-		NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported");
-		return -EOPNOTSUPP;
-	}
-
 	if (!prog)
 		xdp_features_clear_redirect_target(dev);
 

-- 
2.56.0